The efestivals discussion on that is fun with people getting very angry it is the Rolling Stones taking over the festival. What with it being a Phoenix (and not related to the band Phoenix who are playing the other stage) I think this is going to be a theme for the festival.

I wouldn't be surprised if it is going to be some idea of "rebirth for the UK" they'll be pushing in reaction to the rise of the right. It would fit the sort of message Glastonbury would be behind and having them make a statement on it could be repositioning the festival closer to its roots of hippies and socialists that many feel it has drifted from. If we think the last thing they had the pyramid altered for was nuclear disarmament it makes some sense... or it could just breath fire during Jumping Jack Flash. It'll be interesting either way.